narsil/Tanshu.Accounts.Contracts/Data Contracts/InventoryBO.cs

using System;
using System.Runtime.Serialization;

namespace Tanshu.Accounts.Contracts
{

    public class InventoryBO
    {

        public Guid InventoryID { get; set; }

        public Guid VoucherID { get; set; }

        public Guid ProductID { get; set; }
        private decimal quantity;

        public decimal Quantity
        {
            get { return quantity; }
            set
            {
                quantity = value;
                if (amount != null)
                    CalculateAmount();
            }
        }
        private decimal rate;

        public decimal Rate
        {
            get { return rate; }
            set
            {
                rate = value;
                if (amount != null)
                    CalculateAmount();
            }
        }
        decimal vat;

        public decimal Vat
        {
            get { return vat; }
            set
            {
                vat = value; if (amount != null)
                    CalculateAmount();
            }
        }
        decimal serviceTax;

        public decimal ServiceTax
        {
            get { return serviceTax; }
            set
            {
                serviceTax = value; if (amount != null)
                    CalculateAmount();
            }
        }
        decimal discount;


        public decimal Discount
        {
            get { return discount; }
            set
            {
                discount = value; if (amount != null)
                    CalculateAmount();
            }
        }
        decimal? amount;
        

        public decimal Amount
        {
            get
            {
                if (!amount.HasValue)
                    CalculateAmount();
                return amount.Value;
            }
        }
        private void CalculateAmount()
        {
            amount = quantity * rate * (1 + vat + serviceTax) * (1 - discount);
        }
    }
}